这是使用反射的解决方案。如果您需要带有嵌入式结构字段等的更复杂的结构，则必须进一步开发它。
http://play.golang.org/p/iTaDgsdSaI
package mainimport ( "encoding/json" "fmt" "reflect")type M map[string]interface{} // just an aliasvar Record = []byte(`{ "bit_size": 8, "secret_key": false }`)type DB struct { NumBits int `json:"bit_size"` Secret bool `json:"secret_key"`}type User struct { NumBits int `json:"num_bits"`}func main() { d := new(DB) e := json.Unmarshal(Record, d) if e != nil { panic(e) } m := mapFields(d) fmt.Println("Mapped fields: ", m) u := new(User) o := applyMap(u, m) fmt.Println("Applied map: ", o) j, e := json.Marshal(o) if e != nil { panic(e) } fmt.Println("Output JSON: ", string(j))}func applyMap(u *User, m M) M { t := reflect.TypeOf(u).Elem() o := make(M) for i := 0; i < t.NumField(); i++ { f := t.FieldByIndex([]int{i}) // skip unexported fields if f.PkgPath != "" { continue } if x, ok := m[f.Name]; ok { k := f.Tag.Get("json") o[k] = x } } return o}func mapFields(x *DB) M { o := make(M) v := reflect.ValueOf(x).Elem() t := v.Type() for i := 0; i < v.NumField(); i++ { f := t.FieldByIndex([]int{i}) // skip unexported fields if f.PkgPath != "" { continue } o[f.Name] = v.FieldByIndex([]int{i}).Interface() } return o}
